As I Stated above, Mercury is an unclassified Planet, a sort of “free lance,” in the Astrological world.
It is at times “friendly,” at others decidedly “inimical.” It all depends upon the aspect of the other planets toward it.
Those born under Mercury — the Mercurians as they are called — are small in stature, but remarkable for their agility and bodily skill.
Mentally, they are endowed with a versatility which renders them apt to undertake almost any study, trade, or profession, and make a success of it.
They remain young-looking very late in life and their complexion, rather of a creamy white, is often tinted by blushes. The hair is chestnut-colored and curls at the end; the forehead is high, the eyebrows meet, the eyes themselves are deep-set and penetrating, a little too restless, perhaps; the nose is straight, the upper lip protrudes slightly; the chin is long and pointed.
The Mercurians are active to a degree, fond of money-making and clever in business.
Their voice is not strong and yet they are often eloquent, but of an eloquence that does not dazzle; it is of a convincing, not of a showy, style.
They are born logicians and, on that account, are excellent mathematicians; they have wit, are quick at repartee and excel in turning a threatening failure into success.
They are met most frequently among the professions, the medical particularly; they are successful in society and a Mercurian of the fair sex has always a crowd of fascinated admirers in her train when much handsomer women remain uncourted. In fact, adventurers of both sexes are, eight times out of ten, Mercurians, for they need a great deal of personal magnetism to victimize their dupes.
Affected by Saturn, the Mercurian will become extremely dangerous, for he grows secretive, which Mercury is not by nature. Then all these talents for mischief may lead him to crime, such as forgery, perjury, even poisoning.
The defect against which all those born under Mercury ought to guard themselves with a tireless vigilance is a temptation to lie and an irresistible inclination to annex too freely other people’s property by schemes that are called “clever business devices” by the unscrupulous.
Then again, they talk too much for the sake of boasting of their various feats of cleverness, and this weakness leads them into all manner of trouble.
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From Practical Astrology by Comte C. de Saint-Germain